Question

practice for final exam
take this practice exam as many times as youd like to. this practice exam is designed to help you prepare for the final exam and consists of 50 questions from a bank of 200. when you are ready to return to the course and take your final exam you can click the button below.
return to course
a 100 proof liquor is ______________ alcohol by volume.
forty percent
fifty percent
20 percent

Explanation:

The proof of a liquor is defined as twice the percentage of alcohol by volume. So for 100 - proof liquor, the alcohol - by - volume percentage is $\frac{100}{2}=50\%$.

Answer:

fifty percent